/*
 Print.cpp - Base class that provides print() and println()
 Copyright (c) 2008 David A. Mellis.  All right reserved.
 
 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.
 
 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Lesser General Public License for more details.
 
 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
 Modified 23 November 2006 by David A. Mellis
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include "Arduino.h"

#include "Print.h"

// Public Methods //////////////////////////////////////////////////////////////

/* default implementation: may be overridden */
size_t Print::write(const uint8_t *buffer, size_t size) {
	size_t n = 0;
	while (size--) {
		n += write(*buffer++);
	}
	return n;
}

size_t Print::print(const __FlashStringHelper *ifsh) {
	const char *p = (const char *) ifsh;
	size_t n = 0;
	while (1) {
		unsigned char c = pgm_read_byte(p++);
		if (c == 0)
			break;
		n += write(c);
	}
	return n;
}

size_t Print::print(const String &s) {
	size_t n = 0;
	for (uint16_t i = 0; i < s.length(); i++) {
		n += write(s[i]);
	}
	return n;
}

size_t Print::print(const char str[]) {
	return write(str);
}

size_t Print::print(char c) {
	return write(c);
}

size_t Print::print(unsigned char b, int base) {
	return print((unsigned long) b, base);
}

size_t Print::print(int n, int base) {
	return print((long) n, base);
}

size_t Print::print(unsigned int n, int base) {
	return print((unsigned long) n, base);
}

size_t Print::print(long n, int base) {
	if (base == 0) {
		return write(n);
	} else if (base == 10) {
		if (n < 0) {
			int t = print('-');
			n = -n;
			return printNumber(n, 10) + t;
		}
		return printNumber(n, 10);
	} else {
		return printNumber(n, base);
	}
}

size_t Print::print(unsigned long n, int base) {
	if (base == 0)
		return write(n);
	else
		return printNumber(n, base);
}

size_t Print::print(double n, int digits) {
	return printFloat(n, digits);
}

size_t Print::println(const __FlashStringHelper *ifsh) {
	size_t n = print(ifsh);
	n += println();
	return n;
}

size_t Print::print(const Printable& x) {
	return x.printTo(*this);
}

size_t Print::println(void) {
	size_t n = print('\r');
	n += print('\n');
	return n;
}

size_t Print::println(const String &s) {
	size_t n = print(s);
	n += println();
	return n;
}

size_t Print::println(const char c[]) {
	size_t n = print(c);
	n += println();
	return n;
}

size_t Print::println(char c) {
	size_t n = print(c);
	n += println();
	return n;
}

size_t Print::println(unsigned char b, int base) {
	size_t n = print(b, base);
	n += println();
	return n;
}

size_t Print::println(int num, int base) {
	size_t n = print(num, base);
	n += println();
	return n;
}

size_t Print::println(unsigned int num, int base) {
	size_t n = print(num, base);
	n += println();
	return n;
}

size_t Print::println(long num, int base) {
	size_t n = print(num, base);
	n += println();
	return n;
}

size_t Print::println(unsigned long num, int base) {
	size_t n = print(num, base);
	n += println();
	return n;
}

size_t Print::println(double num, int digits) {
	size_t n = print(num, digits);
	n += println();
	return n;
}

size_t Print::println(const Printable& x) {
	size_t n = print(x);
	n += println();
	return n;
}

// Private Methods /////////////////////////////////////////////////////////////

size_t Print::printNumber(unsigned long n, uint8_t base) {
	char buf[8 * sizeof(long) + 1]; // Assumes 8-bit chars plus zero byte.
	char *str = &buf[sizeof(buf) - 1];

	*str = '\0';

	// prevent crash if called with base == 1
	if (base < 2)
		base = 10;

	do {
		unsigned long m = n;
		n /= base;
		char c = m - base * n;
		*--str = c < 10 ? c + '0' : c + 'A' - 10;
	} while (n);

	return write(str);
}

size_t Print::printFloat(double number, uint8_t digits) {
	size_t n = 0;

	if (isnan(number))
		return print("nan");
	if (isinf(number))
		return print("inf");
	if (number > 4294967040.0)
		return print("ovf");  // constant determined empirically
	if (number < -4294967040.0)
		return print("ovf");  // constant determined empirically

	// Handle negative numbers
	if (number < 0.0) {
		n += print('-');
		number = -number;
	}

	// Round correctly so that print(1.999, 2) prints as "2.00"
	double rounding = 0.5;
	for (uint8_t i = 0; i < digits; ++i)
		rounding /= 10.0;

	number += rounding;

	// Extract the integer part of the number and print it
	unsigned long int_part = (unsigned long) number;
	double remainder = number - (double) int_part;
	n += print(int_part);

	// Print the decimal point, but only if there are digits beyond
	if (digits > 0) {
		n += print(".");
	}

	// Extract digits from the remainder one at a time
	while (digits-- > 0) {
		remainder *= 10.0;
		int toPrint = int(remainder);
		n += print(toPrint);
		remainder -= toPrint;
	}

	return n;
}
